was hamid karzai, the president of afghanistan. he released a written statement, sending his condolences, for the loss of those troops and afghan forces, as well. but he was the first to say, special operations forces. and we did con firm through a senior military official they were navy s.e.a.l.s. as you know, bianna, very, very small community of these highly-trained, elite u.s. forces. >> that's true. a devastating blow this morning. martha, you know this area very well. how dangerous is it to fly over thisisegion in afghanistan? >> reporter: well, we've certainly lost several helicopters. but this is the single-largest loss of life in afghanistan, in a single incident, since this war began. helicopters are hit fairly often. but they're usually much smaller helicopters. again, this is how you transport in the field. this is how you transport troops, in these large, chinook helicopters. you're really kind of squeezed in these helicopters. they're the kind that open from the back, so the troops can get out and in.